You may want add a rig that can accommodate the Fuel Jerrycans if the OEM is expensive and not available or regulations perhaps making it difficult. This one below is done available in the Australian Market having fitted on the rear bars which has the corner vision spot lights option
Long Range America | 250 Series Land Cruiser Prado - Standard High-Clearance Rear Bumper
Take your Land Cruiser 250 Series to the next level with the rugged and durable rear bumper by The Cruiser Company, available exclusively at Long Range America. Engineered for off-road enthusiasts, this rear bar offers unmatched protection and performance in challenging terrains. [ml][ul][li...

$3,450 just for the bumper. Another $795 for the can carrier. Not sure, it looks like maybe another $1,145 for the spare tire relocate. Could be well over $5K all said and done. Remains to be seen, but may prove less expensive route than upgrading the OEM tank.